I came across this issue while rewriting and fixing parts of MPS.. This issue seems to be within ProjectRed itself, unless I'm mistaken, as MPS' block breaking algorithm seems to work for every other mod. It does eventually break the block, but never drops it, and it takes an age for it to drop (as if punching the block). It seems however that vanilla and PR pickaxes work just fine with it. We're checking to see if the block can be harvested using a call to ForgeHooks.canToolHarvestBlock() if that's helpful at all..

The rest of the pickaxe module implementation (which has been left unchanged in commits to be pushed) can be seen here: https://github.com/MachineMuse/MachineMusePowersuits/blob/master/src/main/scala/net/machinemuse/powersuits/powermodule/tool/PickaxeModule.java

There are no helpful stacktraces or logs associated with this issue.

Should be fixed by a5df88b.